CN214822707U - AC charging CC signal detection circuit with awakening function - Google Patents
AC charging CC signal detection circuit with awakening function Download PDFInfo
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- CN214822707U CN214822707U CN202120140867.2U CN202120140867U CN214822707U CN 214822707 U CN214822707 U CN 214822707U CN 202120140867 U CN202120140867 U CN 202120140867U CN 214822707 U CN214822707 U CN 214822707U
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Abstract
The utility model discloses an AC charging CC signal detection circuit with a wake-up function, which comprises a first power module; the input end of the first power supply module is connected with the normal power 12V, and the output end of the first power supply module is connected with the first input end of the awakening output module; a second input end of the awakening input module is connected with a CC signal end of the alternating current charging interface, and an output end WKP of the awakening input module is connected with a second input end of the awakening output module; the third input end of the awakening output module is connected with the output end OFF of the BMS main control chip, and the output end EN is connected with the input end of the second power supply module; the first input end of the sampling module is connected with the output end of the second power supply module, the second input end of the sampling module is connected with the CC signal end of the existing AC charging interface socket, and the output end VTCC of the sampling module is connected with the second input end of the BMS main control chip; the first input end of the BMS main control chip is connected with the output end of the second power supply module. The utility model discloses can realize the detection function of interface connection state and BMS's function of awakening up simultaneously.
Description
Technical Field
The utility model relates to a battery management technology field especially relates to an exchange CC signal detection circuitry that charges with awaken function up.
Background
A Battery Management System (BMS), which is a Battery protection device and is also a bridge between a Battery and a load terminal, provides protection functions such as overcharge, overdischarge, and over-temperature for the Battery according to the actual usage state of the Battery monitored on line, and ensures that the Battery is safely used. The battery management system BMS is widely used in various fields such as electric vehicles, communication base stations, and robots.
Taking an electric automobile as an example, according to the requirement of the new national standard GB/T18487.1-2015 (part 1 general requirement of an electric automobile conduction charging system), when an alternating current charging mode is adopted to charge a vehicle-mounted power battery system, a vehicle-mounted monitoring device or BMS needs to judge whether an interface is completely connected through a charging connection confirmation terminal CC in an alternating current charging interface, and charging can be allowed only when the interface is in a completely connected state, so that the condition that charging is started when the interface is not completely connected is avoided, and the safety of a human body is ensured.
In the prior art, some schemes can detect the signal state of the charging connection confirmation terminal CC and judge whether the interface is completely connected, but cannot wake up the BMS through the charging connection confirmation terminal CC and can only wake up the BMS through other ports; some schemes have a wake-up function, but when charging is finished and the charging gun is not pulled out, the BMS cannot enter the sleep state, so that the BMS consumes the electric quantity of the vehicle-mounted storage battery or the power battery system all the time, and normal use of the vehicle is affected.
Therefore, it is urgently required to develop an ac charging CC signal detection circuit having a wake-up function, which can detect whether an interface is completely connected, and can wake up the BMS without affecting the BMS sleep.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a to the technical defect that prior art exists, provide an alternating current charging CC signal detection circuitry with awaken up function.
Therefore, the utility model provides an alternating current charging CC signal detection circuit with awakening function, which comprises a first power module, an awakening input module, an awakening output module, a sampling module, a BMS main control chip and a second power module;
the input end of the first power supply module is connected with a normal power 12V;
the output end of the first power supply module is connected with the first input end of the awakening output module and is used for providing constant 5V power for the awakening output module;
the first input end of the awakening input module is connected with the normal power 12V;
a second input end of the wakeup input module is connected with a CC signal end of the existing AC charging interface socket and is used for receiving a charging connection confirmation CC signal from the CC signal end;
the output end WKP of the awakening input module is connected with the second input end of the awakening output module and used for outputting an awakening signal WKP in a corresponding level state to the awakening output module according to the state of a CC signal end of the AC charging interface socket;
the first input end of the awakening output module is connected with the output end of the first power supply module and is used for receiving the constant current 5V output by the first power supply module;
a wake-up output module, a second input end of which is connected with the output end WKP of the wake-up input module, and is used for receiving a wake-up signal WKP sent by the wake-up input module;
the third input end of the awakening output module is connected with the output end OFF of the BMS main control chip and is used for receiving the sleep control signal OFF sent by the BMS main control chip, and correspondingly outputting an enable signal EN to the second power supply module at the output end EN of the awakening output module according to the state of the signal to control the on-OFF of the second power supply module;
the output end EN of the awakening output module is connected with the input end of the second power supply module and is used for correspondingly outputting an enable signal EN with a corresponding level state to the second power supply module according to the level state of the awakening signal WKP sent by the awakening input module, and controlling whether the second power supply module outputs DC5V to the BMS main control chip or not, namely controlling the on-off of the second power supply module;
the first input end of the sampling module is connected with the output end of the second power supply module and is used for receiving DC 5V;
the second input end of the sampling module is connected with the CC signal end of the AC charging interface socket and is used for receiving a charging connection confirmation CC signal output by the CC signal end of the AC charging interface socket;
the output end VTCC of the sampling module is connected with the second input end of the BMS main control chip and is used for outputting a sampling signal VTCC of the CC signal;
the first input end of the BMS main control chip is connected with the output end of the second power supply module and is used for receiving DC5V output by the second power supply module;
the second power module is used for determining whether to output DC5V to the BMS main control chip or not according to the control of the awakening output module, and awakening the BMS main control chip when outputting DC 5V;
the second input end of the BMS main control chip is connected with the output end VTCC of the sampling module and is used for receiving the sampling signal VTCC output by the output end VTCC of the sampling module;
the BMS main control chip is used for judging the connection state of the CC signal end of the alternating current charging interface socket according to the voltage value of the high potential of the sampling signal VTCC;
and the output end OFF of the BMS main control chip is connected with the third input end of the awakening output module and used for outputting the dormancy control signal OFF to the awakening output module.
Preferably, the voltage value of the sampling signal VTCC is as follows according to different connection conditions of the charging gun:
when the alternating current charging interface socket is not inserted into the charging gun, a sampling signal VTCC output by the output end VTCC of the sampling module is at a low level;
when the alternating current charging interface socket is inserted into the charging gun, the sampling signal VTCC output by the output end VTCC of the sampling module is changed from low level to high level;
when charging is finished and the charging gun is not pulled out of the alternating current charging interface socket, a sampling signal VTCC output by the sampling module output end VTCC is changed from a high level to a low level;
and fourthly, when the charging gun is pulled out of the AC charging interface socket, the sampling signal VTCC output by the output end VTCC of the sampling module keeps a low level unchanged.
Preferably, the wake-up input module includes: resistors R1-R7, diodes D1-D2 and switching tubes Q1-Q2, wherein:
a 1 st pin of the resistor R1 is used as a second input end of the awakening input module and is connected with a normal power 12V;
the 1 st pin of the resistor R1 is also connected with the 1 st pin of the resistor R4;
a 2 nd pin of the resistor R1 is connected with the anode of the diode D1;
the cathode of the diode D1 is used as a second input end of the awakening input module and is connected with an alternating current charging interface CC signal end of the alternating current charging interface socket;
the AC charging interface CC signal end of the AC charging interface socket is also respectively connected with the cathode of the diode D2, the 1 st pin of the resistor R3 and the grid G of the switch tube Q1;
the anode of the diode D2 is connected with the 1 st pin of the resistor R2;
the 2 nd pin of the resistor R2 is connected with the V1 end;
the V1 end is respectively connected with the 2 nd pin of the resistor R5, the 1 st pin of the resistor R6 and the base B of the switch tube Q2;
the 1 st pin of the resistor R5 is respectively connected with the 2 nd pin of the resistor R4 and the emitter E of the switching tube Q2;
the 2 nd pin of the resistor R6 is respectively connected with the 2 nd pin of the resistor R3 and the source S of the switching tube Q1;
the drain D of the switching tube Q1 is connected with the ground end GND;
the collector C of the switch tube Q2 is connected with the 1 st pin of the resistor R7;
the 2 nd pin of the resistor R7 is connected with the ground terminal GND;
and the collector C of the switching tube Q2 is used as the output end WKP of the awakening input module.
Preferably, the wake-up output module includes: resistors R8-R21, diodes D3-D4, capacitors C1-C3, switch tubes Q3-Q5 and a T trigger U1, wherein:
a 1 st pin of the resistor R21 is used as a first input end of the awakening output module, is connected with an output end of the first power supply module, and is used for receiving a constant voltage of 5V;
the 2 nd pin of the resistor R21 is connected with the emitter E of the switching tube Q5;
the collector C of the switch tube Q5 is connected with the 1 st pin of the resistor R15;
a base electrode B of the switching tube Q5 is connected with a collector electrode C of the switching tube Q4;
a base B of the switching tube Q4, which is respectively connected with the 1 st pin of the resistor R19 and the 2 nd pin of the resistor R20;
an emitter E of the switching tube Q4 is respectively connected with a No. 2 pin of the resistor R19 and a ground end GND;
a 1 st pin of the resistor R20 is used as a second input end of the awakening output module and is connected with an output end WKP of the awakening input module;
the 1 st pin of the resistor R20 is also connected with the 1 st pin of the resistor R8;
a 2 nd pin of the resistor R15 is connected with a power supply input terminal VCC of the T trigger U1;
the input end T of the T trigger U1 is connected with the TIN end;
the TIN end is respectively connected with the 2 nd pin of the resistor R8, the 1 st pin of the capacitor C1, the 2 nd pin of the resistor R9 and the 2 nd pin of the resistor R12;
a clock signal input end CP of the T-flip-flop U1 is respectively connected with the cathode of the diode D3, the cathode of the diode D4 and the 1 st pin of the resistor R11;
the output end Q of the T trigger U1 is connected with the 1 st pin of the resistor R16;
a 2 nd pin of the resistor R16 is used as an output end of the awakening output module and is connected with an enable end EN;
the enabling end EN is connected with the input end of the second power supply module;
the enable terminal EN is also connected with a 1 st pin of the resistor R17;
the 2 nd pin of the resistor R17 is connected with the ground terminal GND;
the anode of the diode D3 is connected with the 1 st pin of the resistor R18;
the 2 nd pin of the resistor R18 is connected with the output end OFF of the BMS main control chip;
the 2 nd pin of the capacitor C1 is connected with a ground terminal GND;
the 2 nd pin of the resistor R11 is connected with the ground terminal GND;
the anode of the diode D4 is connected with the V2 end;
a V2 terminal connected with the collector C of the switch tube Q3 and the 1 st pin of the resistor R10 respectively;
the 2 nd pin of the resistor R10 is respectively connected with the 1 st pin of the capacitor C2 and the 1 st pin of the resistor R9;
the 2 nd pin of the capacitor C2 is connected with a ground terminal GND;
a 2 nd pin of the resistor R9 is connected with a TIN end;
a base B of the switching tube Q3, which is respectively connected with the 1 st pin of the resistor R13 and the 1 st pin of the resistor R14;
an emitter E of the switching tube Q3 is connected with a ground end GND;
the 2 nd pin of the resistor R14 is connected with the ground terminal GND;
the 2 nd pin of the resistor R13 is respectively connected with the 1 st pin of the capacitor C3 and the 1 st pin of the resistor R12;
a 2 nd pin of the resistor R12 is connected with a TIN end;
Preferably, the T flip-flop U1 is a positive edge triggered flip-flop.
Preferably, the sampling module comprises: resistors R30-R33 and a diode D20, wherein:
a 2 nd pin of the resistor R30, which is used as a first input terminal of the sampling module, is connected to the output terminal of the second power supply module, and is used for receiving DC 5V;
the 1 st pin of the resistor R30 is connected with the V3 end;
a V3 terminal connected to the 1 st pin of the resistor R31 and the 2 nd pin of the resistor R33, respectively;
a 2 nd pin of the resistor R31, which is used as an output terminal VTCC of the sampling module;
the 2 nd pin of the resistor R31 is connected with the 1 st pin of the resistor R32;
the 2 nd pin of the resistor R32 is connected with the ground terminal GND;
the 1 st pin of the resistor R33 is connected with the anode of the diode D20;
and the cathode of the diode D20 is used as a second input end of the sampling module and is connected with an AC charging interface CC signal end of the AC charging interface socket.
By the above the utility model provides a technical scheme is visible, compares with prior art, the utility model provides a CC signal detection circuitry that charges exchanges with awakening function, its design science can detect whether the interface connects completely, can awaken up BMS again and do not influence BMS dormancy. Meanwhile, the detection function of the interface connection state and the awakening function of the BMS are realized, and the method has great production practice significance.
For the technical scheme of the utility model, the hardware circuit design is scientific, the electronic components are of universal application models, the model selection is easy, and the components are low in price;
in addition because the utility model discloses a hardware circuit consumption is lower, so can adopt the surface mounted type miniwatt electronic components, therefore circuit board occupation space is little, has greatly reduced material cost. Therefore, the technical scheme of the utility model has very strong practical value and market spreading value.
Drawings
Fig. 1 is a schematic block diagram of an ac charging CC signal detection circuit with a wake-up function according to the present invention;
fig. 2 is a schematic diagram of a wake-up input module in the ac charging CC signal detection circuit with wake-up function provided by the present invention;
fig. 3 is a schematic diagram of a wake-up output module in the ac charging CC signal detection circuit with wake-up function provided by the present invention;
fig. 4 is the utility model provides a pair of in the ac charging CC signal detection circuitry with awakening function, sampling module's schematic diagram.
Detailed Description
In order to make the technical means of the present invention easier to understand, the present application will be further described in detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the present application are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 to 4, the present invention provides an ac charging CC signal detection circuit with wake-up function, which includes a first power module (specifically, a 5V normal power module) 100, a wake-up input module 200, a wake-up output module 300, a sampling module 400, a BMS main control chip 500, and a second power module (specifically, a 5V power module) 600;
the input end of the first power module 100 is connected with a normal voltage 12V;
a first power module 100, an output end of which is connected to a first input end of the wakeup output module 300, and configured to provide a constant voltage of 5V for the wakeup output module 300;
note that the input terminal of the first power module 100 is connected to an external power supply of a constant voltage 12V. Wherein the normal electricity is 12V, and is generally a vehicle-mounted 12V storage battery or a vehicle-mounted 12V DC-DC; the constant 5V is a continuous 5V dc output, and the 5V output is not stopped by the BMS sleep.
A wake-up input module 200, a first input end of which is connected with a normal power 12V;
a second input end of the wakeup input module 200 is connected to a CC signal end of the existing ac charging interface socket, and is configured to receive a charging connection confirmation CC signal from the CC signal end;
the wake-up input module 200, an output terminal WKP of which is connected to the second input terminal of the wake-up output module 300, is configured to output a wake-up signal WKP in a corresponding level state to the wake-up output module 300 according to a state of a CC signal terminal of the ac charging interface socket;
the alternating current charging interface and the socket thereof meet the requirements of a new national standard GB/T20234.2-2015 (the 2 nd part of the alternating current charging interface of the connecting device for electric vehicle conduction charging); according to the regulation of new national standard GB/T18487.1-2015 (electric automobile conduction charging system part 1 general requirement), the connected mode of the interface that charges of exchanging should accord with charge mode 3 connected mode B and charge mode 3 connected mode C and control principle, and the state of the interface CC signal end that charges of exchanging should accord with the regulation to its connected state and resistance value, the utility model discloses divide into two kinds with its connected state:
1) an effective resistance state, indicating that a charging gun has been inserted;
2) high impedance state, indicating no charging gun is inserted.
A wake-up output module 300, a first input end of which is connected to the output end of the first power module 100, and configured to receive the constant voltage 5V output by the first power module 100;
a wake-up output module 300, a second input end of which is connected to the output end WKP of the wake-up input module 200, and configured to receive a wake-up signal WKP sent by the wake-up input module 200;
a wake-up output module 300, a third input terminal of which is connected to the output terminal OFF of the BMS main control chip 500, and configured to receive the sleep control signal OFF sent by the BMS main control chip 500, and output an enable signal EN to the second power module 600 at the output terminal EN thereof according to a state of the signal, so as to control the on/OFF of the second power module 600;
the wake-up output module 300, an output end EN of which is connected to an input end of the second power module 600, is configured to correspondingly output an enable signal EN in a corresponding level state to the second power module 600 according to the level state of the wake-up signal WKP sent by the wake-up input module 200, and control whether the second power module 600 outputs DC5V (direct current 5V) to the BMS main control chip 500, that is, control on/off of the second power module 600;
DC5V is not a continuous 5V DC output, but stops the 5V output due to BMS sleep.
A sampling module 400 having a first input connected to the output of the second power module 600 for receiving DC 5V;
a second input end of the sampling module 400 is connected to the CC signal end of the ac charging interface socket, and is configured to receive a charging connection confirmation CC signal output by the CC signal end of the ac charging interface socket;
a sampling module 400, an output terminal VTCC of which is connected to a second input terminal of the BMS main control chip 500, for outputting a sampling signal VTCC for the CC signal;
a BMS main control chip 500, a first input terminal of which is connected to an output terminal of the second power module 600, for receiving DC5V output by the second power module 600;
a second power module 600 for determining whether to output DC5V to the BMS main control chip 500 according to the control of the wake-up output module 300, and waking up the BMS main control chip 500 when outputting DC 5V;
a BMS host control chip 500, a second input terminal of which is connected to the output terminal VTCC of the sampling module 400, for receiving the sampling signal VTCC output by the output terminal VTCC of the sampling module 400;
the BMS main control chip 500 is configured to determine a connection state (disconnected or connected) of the CC signal terminal of the ac charging interface socket according to a voltage value of a high potential of the sampling signal VTCC; according to different connection conditions of the charging gun, the voltage value conditions of the sampling signal VTCC are as follows:
when the charging gun is not inserted into the alternating current charging interface socket, a sampling signal VTCC output by an output end VTCC of the sampling module 400 is at a low level;
when the alternating current charging interface socket is inserted into the charging gun, the sampling signal VTCC output by the output end VTCC of the sampling module 400 is changed from low level to high level;
when charging is finished and the charging gun is not pulled out of the alternating current charging interface socket, a sampling signal VTCC output by an output end VTCC of the sampling module 400 is changed from a high level to a low level;
and fourthly, when the charging gun is pulled out of the AC charging interface socket, the sampling signal VTCC output by the output end VTCC of the sampling module 400 keeps a low level unchanged.
The BMS main control chip 500 has an output terminal OFF connected to a third input terminal of the wake-up output module 300, and is configured to output a sleep control signal OFF to the wake-up output module 300.
To the utility model discloses, it is required to explain that first power module (specifically be 5V normal electricity power module) 100 and second power module (specifically be 5V power module) 600 are the power supply circuit of general application among the current BMS technical scheme, and the technical staff can easily obtain and need not any innovation and can use, and this power supply circuit's technical scheme does not belong to the utility model discloses a technical scheme, the event does not make concrete explanation here.
In particular, it should be noted that, the first power module (specifically, the 5V normal power module) 100 and the second power module (specifically, the 5V power module) 600 may use a low-power consumption and step-down dc power circuit or an integrated power module, such as a linear LDO, a switching power supply, which are commonly used at present, and the dc power circuit or the integrated power module should have a power output enabling function so as to control the on/off of the power output.
It should be noted that the charging strategy that BMS main control chip 500 has stored does not belong to the technical scheme of the utility model, the utility model discloses only utilize its dormancy control signal OFF according to the output of charging strategy.
In order to understand the technical solution of the present invention more clearly, the working principle of the present invention is explained below. The method comprises the following specific steps:
firstly, when a charging gun is not inserted into a socket of an existing alternating current charging interface, a signal end of an alternating current charging interface CC of the alternating current charging gun socket is in a high-resistance state, a wake-up signal WKP output by an output end WKP of the wake-up input module 200 is in a low level, so that an enable signal EN output by an output end EN of the wake-up output module 300 is also in a low level, and thus the second power module 600 does not have DC5V output, so that the BMS main control chip 500 cannot be woken up, and a sleep control signal OFF output by an output end OFF is in a low level.
Since the second power module 600 does not output DC5V, the sampling signal VTCC output by the output terminal VTCC of the sampling module 400 is low.
When a charging gun is inserted into the socket of the existing alternating current charging interface, the signal end of the alternating current charging interface CC of the alternating current charging gun socket is in an effective resistance state, the wake-up signal WKP output by the output end WKP of the wake-up input module 200 changes from a low level to a high level, so that the enable signal EN output by the output end EN of the wake-up output module 300 also changes from a low level to a high level, and the second power module 600 outputs DC5V to wake up the BMS main control chip 500; before the charging is finished, the sleep control signal output from the output terminal of the BMS main control chip 500 is turned OFF and always kept in a low level state.
Since the DC5V is turned on and the signal terminal of the ac charging interface CC changes to the active resistance state, the sampling signal VTCC output by the output terminal VTCC of the sampling module 400 also changes from the low level to the high level, and the voltage amplitude of the high level thereof changes with the resistance of the active resistance.
When charging is finished and a charging gun is not pulled out of a socket of the existing alternating current charging interface, a CC signal end of the alternating current charging interface keeps an effective resistance state, and a wake-up signal WKP output by an output end WKP of the wake-up input module 200 keeps a high level unchanged;
according to the charging strategy, when the charging is finished, the sleep control signal OFF output by the output terminal OFF of the BMS main control chip 500 is changed from a low level to a positive pulse signal, so that the enable signal EN output by the output terminal EN of the wake-up output module 300 is changed from a high level to a low level, and the second power module 600 stops outputting the DC5V, therefore, the BMS main control chip 500 enters a sleep state due to the power failure, and the sleep control signal OFF output by the output terminal OFF thereof is also changed to a low level, so that the output terminal EN of the wake-up output module 300 is kept in a low level state, and the BMS main control chip is locked to keep the sleep state.
At this time, since the second power module 600 does not output DC5V, the sampling signal VTCC output by the output terminal VTCC of the sampling module 400 changes from high to low.
Fourthly, when the charging gun is pulled out of the socket of the existing alternating current charging interface, the CC signal end of the alternating current charging interface is changed into a high impedance state, the wake-up signal WKP output by the output end WKP of the wake-up input module 200 is changed from a high level to a low level, the enable signal EN output by the output end EN of the wake-up output module 300 still maintains the low level, so that the second power module 600 does not have DC5V output, and the BMS main control chip 500 is locked into a sleep state.
Since the second power module 600 does not output DC5V, the sampling signal VTCC output by the output terminal VTCC of the sampling module 400 remains low.
In the present invention, in the specific implementation, as shown in fig. 2, the wake-up input module 200 includes: resistors R1-R7, diodes D1-D2 and switching tubes Q1-Q2, wherein:
a 1 st pin of the resistor R1, which is a second input terminal of the wake-up input module 200, is connected to a normal voltage of 12V;
the 1 st pin of the resistor R1 is also connected with the 1 st pin of the resistor R4;
a 2 nd pin of the resistor R1 is connected with the anode of the diode D1;
a cathode of the diode D1, serving as a second input end of the wake-up input module 200, is connected to an ac charging interface CC signal end of the ac charging interface socket;
the AC charging interface CC signal end of the AC charging interface socket is also respectively connected with the cathode of the diode D2, the 1 st pin of the resistor R3 and the grid G of the switch tube Q1;
the anode of the diode D2 is connected with the 1 st pin of the resistor R2;
the 2 nd pin of the resistor R2 is connected with a V1 terminal (a wiring port);
the V1 end is respectively connected with the 2 nd pin of the resistor R5, the 1 st pin of the resistor R6 and the base B of the switch tube Q2;
the 1 st pin of the resistor R5 is respectively connected with the 2 nd pin of the resistor R4 and the emitter E of the switching tube Q2;
the 2 nd pin of the resistor R6 is respectively connected with the 2 nd pin of the resistor R3 and the source S of the switching tube Q1;
the drain D of the switching tube Q1 is connected with the ground end GND;
the collector C of the switch tube Q2 is connected with the 1 st pin of the resistor R7;
the 2 nd pin of the resistor R7 is connected with the ground terminal GND;
the collector C of the switching tube Q2 is used as the output WKP of the wake-up input module 200.
The utility model discloses in, in the concrete realization, awaken up input module 200's theory of operation as follows:
when a charging gun is not inserted into the ac charging interface socket, the CC signal terminal of the ac charging interface socket is in a high impedance state, the switching tube Q2 is turned off, the CC signal terminal and the V1 terminal are at the same potential, the resistor R3 makes the gate-source electrode of the switching tube Q1 at the same potential, so that the switching tube Q1 is turned off, and the output terminal WKP of the wake-up input module 200 is grounded by the resistor R7 to be at a low level; the low level WKP signal cannot wake up the BMS master control chip 500.
When a charging gun is inserted into the alternating current charging interface socket, the signal end of the alternating current charging interface CC is in an effective resistance state RCC, and under the partial pressure action of the resistor RCC and the resistor R1, the signal end of the alternating current charging interface CC is changed into a low potential, so that the diode D2, the switch tube Q1 and the switch tube Q2 are changed from off to on, at the moment, the voltage at the V1 end is greater than that of the signal end of the CC, and the voltage difference between the two ends is greater than the on-off voltage of the switch tube Q2; after the constant voltage 12V is divided by the resistor R4, the switch tube Q2 and the resistor R7, the wake-up signal terminal WKP is changed from low level to high level; the BMS master control chip 500 can be awakened only when the WKP signal state is high.
After the switch Q1 is turned on, the voltage at the V1 end is reduced to be smaller than the voltage at the CC signal end due to the voltage dividing action of the resistor R4, the switch Q2 and the resistor R6, so the diode D2 is turned off.
When the charging gun is pulled out of the alternating-current charging interface socket, the signal end of the alternating-current charging interface CC of the alternating-current charging interface socket is changed from an effective resistance state RCC to a high resistance state, the switching tubes Q1 and Q2 are changed from conduction to cut-off, and the wake-up signal end WKP is changed from a high level to a low level.
In the present invention, in the specific implementation, as shown in fig. 3, the wake-up output module 300 includes: resistors R8-R21, diodes D3-D4, capacitors C1-C3, switch tubes Q3-Q5 and a T trigger U1, wherein:
a 1 st pin of the resistor R21, serving as a first input terminal of the wake-up output module 300, is connected to an output terminal of the first power module 100, and is configured to receive a constant voltage of 5V;
the 2 nd pin of the resistor R21 is connected with the emitter E of the switching tube Q5;
the collector C of the switch tube Q5 is connected with the 1 st pin of the resistor R15;
a base electrode B of the switching tube Q5 is connected with a collector electrode C of the switching tube Q4;
a base B of the switching tube Q4, which is respectively connected with the 1 st pin of the resistor R19 and the 2 nd pin of the resistor R20;
an emitter E of the switching tube Q4 is respectively connected with a No. 2 pin of the resistor R19 and a ground end GND;
a 1 st pin of the resistor R20, serving as a second input end of the wake-up output module 300, is connected to the output end WKP of the wake-up input module 200;
the 1 st pin of the resistor R20 is also connected with the 1 st pin of the resistor R8;
a 2 nd pin of the resistor R15 is connected with a power supply input terminal VCC of the T trigger U1;
an input end T of the T trigger U1 is connected with a TIN end (a wiring port);
the TIN end is respectively connected with the 2 nd pin of the resistor R8, the 1 st pin of the capacitor C1, the 2 nd pin of the resistor R9 and the 2 nd pin of the resistor R12;
a clock signal input end CP of the T-flip-flop U1 is respectively connected with the cathode of the diode D3, the cathode of the diode D4 and the 1 st pin of the resistor R11;
the output end Q of the T trigger U1 is connected with the 1 st pin of the resistor R16;
a 2 nd pin of the resistor R16, which is an output terminal of the wake-up output module 300, is connected to the enable terminal EN;
an enable terminal EN connected to an input terminal of the second power module 600;
the enable terminal EN is also connected with a 1 st pin of the resistor R17;
the 2 nd pin of the resistor R17 is connected with the ground terminal GND;
the anode of the diode D3 is connected with the 1 st pin of the resistor R18;
the 2 nd pin of the resistor R18 is connected to the output terminal OFF of the BMS main control chip 500;
the 2 nd pin of the capacitor C1 is connected with a ground terminal GND;
the 2 nd pin of the resistor R11 is connected with the ground terminal GND;
the anode of the diode D4 is connected with the V2 end;
a V2 terminal connected with the collector C of the switch tube Q3 and the 1 st pin of the resistor R10 respectively;
the 2 nd pin of the resistor R10 is respectively connected with the 1 st pin of the capacitor C2 and the 1 st pin of the resistor R9;
the 2 nd pin of the capacitor C2 is connected with a ground terminal GND;
a 2 nd pin of the resistor R9 is connected with a TIN end;
a base B of the switching tube Q3, which is respectively connected with the 1 st pin of the resistor R13 and the 1 st pin of the resistor R14;
an emitter E of the switching tube Q3 is connected with a ground end GND;
the 2 nd pin of the resistor R14 is connected with the ground terminal GND;
the 2 nd pin of the resistor R13 is respectively connected with the 1 st pin of the capacitor C3 and the 1 st pin of the resistor R12;
a 2 nd pin of the resistor R12 is connected with a TIN end;
Note that the T flip-flop U1 is a positive edge triggered flip-flop.
The utility model discloses in, on specifically realizing, awaken up output module 300's theory of operation as follows:
when a charging gun is not inserted into the ac charging interface socket, the CC signal terminal of the ac charging interface socket is in a high impedance state, the wake-up signal WKP output by the wake-up input module 200 is at a low level, so that the switching tubes Q4 and Q5 are cut OFF, the T flip-flop U1 is not normally powered by 5V, and the output terminal Q and the enable terminal EN of the wake-up output module are both at a low level, so that the second power module 600 does not have DC5V output and cannot wake up the BMS main control chip 500, and therefore the sleep control signal OFF output by the output terminal OFF of the BMS main control chip 500 is at a low level, so that the diode D3 is cut OFF;
the low wake-up signal WKP makes the TIN terminal low, so that the switch Q3 and the diode D4 are both turned off, and the V2 terminal is also low;
the resistor R11 pulls the clock signal input CP of the T flip-flop U1 low.
When a charging gun is inserted into the alternating-current charging interface socket, a signal end of an alternating-current charging interface CC of the alternating-current charging interface socket is changed from a high-resistance state to an effective resistance state RCC, so that a wake-up signal WKP output by the wake-up input module 200 is changed from a low level to a high level, switching tubes Q4 and Q5 are changed from off to on, the T trigger U1 is switched on with a normal power of 5V, and an output end Q of the T trigger U1 is pulled down to a low level by a resistor R17;
after the high-level wake-up signal WKP is delayed by the resistor R8 and the capacitor C1, the TIN terminal is changed from low level to high level, firstly, the input terminal T of the T flip-flop U1 is changed from low level to high level, then, after the delay of the resistor R9 and the capacitor C2, the V2 terminal is changed from low level to high level, the diode D4 is changed from off to on, a positive edge trigger signal is output to the clock signal input terminal CP of the T flip-flop U1, the output terminal Q of the T flip-flop U1 is changed from low level to high level, and the enable terminal EN of the wake-up output module is also changed from low level to high level, so that the second power module 600 outputs DC5V, and wakes up the BMS main control chip 500;
after the BMS master control chip 500 is awakened, the sleep control signal OFF output by the output terminal OFF remains unchanged at a low level, so that the diode D3 continues to be cut OFF;
after the high-level signal at the TIN end is delayed by a resistor R12 and a capacitor C3, the switching tube Q3 is turned from off to on, and the V2 end is turned from high to low and is equal to the saturated conduction voltage drop of the switching tube Q3; at this time, the voltage at the V2 terminal is not enough to turn on the diode D4, so the diode D4 is turned from on to off, the clock signal input end CP of the T flip-flop U1 is turned from high level to low level, the level change has no influence on the signal state of the output end Q of the T flip-flop U1, the output end Q of the T flip-flop U1 keeps high level, the enable terminal EN of the wake-up output module also keeps high level, and the BMS main control chip 500 is always in a wake-up state.
Since both diodes D3 and D4 are turned off, the resistor R11 pulls the clock signal input CP of the T flip-flop U1 low.
It should be noted that the delay time of the resistor R9 and the capacitor C2 is longer than the delay time of the resistor R8 and the capacitor C1.
It should be noted that the delay time of the resistor R12 and the capacitor C3 is longer than the delay time of the resistor R9 and the capacitor C2, and the delay time of the resistor R12 and the capacitor C3 should enable the T flip-flop U1 to flip its state normally.
When charging is finished and the charging gun is not pulled out of the alternating current charging interface socket, the signal end of the alternating current charging interface CC of the alternating current charging interface socket keeps an effective resistance state RCC, the wake-up signal WKP output by the wake-up input module 200 keeps a high level, the input end T and the output end Q of the T trigger U1 keep the high level unchanged, and the BMS main control chip 500 is still in a wake-up state;
according to the charging strategy, when the charging is finished, the output terminal OFF of the BMS main control chip 500 is changed from low level to high level, so that the diode D3 is changed from cut-OFF to conduction, and then a positive edge trigger signal is output to the clock signal input terminal CP of the T flip-flop U1, so that the output terminal Q of the T flip-flop U1 is changed from high level to low level, the enable terminal EN of the wake-up output module is also changed from high level to low level, so that the second power module 600 does not output DC5V any more, so that the BMS main control chip 500 enters the sleep state from the wake-up state, and the output terminal OFF is changed from high level to low level, so that the diode D3 is changed from conduction to cut-OFF;
meanwhile, since the wake-up signal WKP output by the wake-up input module 200 is at a high level, the switching tube Q3 and the diode D4 continue to be turned off, and the resistor R11 continues to keep the clock signal input end CP of the T-flip-flop U1 at a low level, so that the output end Q of the T-flip-flop U1 keeps at a low level, the enable end EN of the wake-up output module also keeps at a low level, so that the second power module 600 does not have the DC5V output, and the BMS main control chip 500 is locked in a sleep state.
When the charging gun is pulled out of the ac charging interface socket, the ac charging interface CC signal end of the ac charging interface socket is changed from the effective resistance state RCC to the high resistance state, the wake-up signal WKP output by the output end WKP of the wake-up input module 200 is changed from the high level to the low level, the switching tubes Q4 and Q5 are changed from on to OFF, so that the T-flip-flop U1 is no longer switched to the normal 5V, the output end Q thereof is pulled down to the low level by the resistor R17, and the second power module 600 is no longer outputting the DC5V, thereby the BMS main control chip 500 enters the sleep state from the wake-up state, the output end thereof is the low level, and the diode D3 is kept in the OFF state;
the low-level wake-up signal WKP turns off the switch Q3 from on, at which time the diode D4 continues to keep off, and the resistor R11 locks the clock signal input CP of the T-flip-flop U1 to low level.
In the present invention, in particular, referring to fig. 4, the sampling module 400 includes: resistors R30-R33 and a diode D20, wherein:
a 2 nd pin of the resistor R30, serving as a first input terminal of the sampling module 400, connected to the output terminal of the second power module 600, for receiving DC 5V;
the 1 st pin of the resistor R30 is connected with the V3 end;
a V3 terminal connected to the 1 st pin of the resistor R31 and the 2 nd pin of the resistor R33, respectively;
the 2 nd pin of the resistor R31 is connected with the 1 st pin of the resistor R32;
the 2 nd pin of the resistor R32 is connected with the ground terminal GND;
the 1 st pin of the resistor R33 is connected with the anode of the diode D20;
the cathode of the diode D20, which is the second input terminal of the sampling module 400, is connected to the ac charging interface CC signal terminal of the ac charging interface socket.
The utility model discloses in, in the concrete realization, sampling module 400's theory of operation as follows:
firstly, when a charging gun is not inserted into the ac charging interface socket, the ac charging interface CC signal end of the ac charging interface socket is in a high-resistance state, and the wake-up signal WKP output by the wake-up input module 200 is in a low level, so that no DC5V is output by the second power module 600, and therefore the sampling signal VTCC of the output end VTCC of the sampling module 400 is pulled down to 0V by the resistor R22.
When a charging gun is inserted into the alternating-current charging interface socket, the alternating-current charging interface CC signal end of the alternating-current charging interface socket is changed from a high-resistance state to an effective-resistance state RCC, so that the wake-up signal WKP output by the wake-up input module 200 is changed from a low level to a high level, and then the second power module 600 outputs DC 5V;
an effective resistor RCC at a signal end of an AC charging interface CC is connected in series with a resistor R33 and then connected in parallel with a resistor R31 and a resistor R32, so that a voltage at a V3 end is smaller than DC5V, and after voltage division of the resistor R31 and the resistor R32, a sampling signal VTCC is changed from 0V to a high potential, and the voltage value of the high potential is changed due to the change of the resistance value of the effective resistor RCC.
It should be noted that, in the charging strategy, the BMS main control chip 500 may determine the connection state (disconnection and connection) of the ac charging interface and may also determine the capacity of the charging cable, including 10A, 16A, 32A, and 64A, according to the voltage value of the high potential of the sampling signal VTCC, according to the determination criterion that the new national standard for charging is to be met.
When charging is finished and the charging gun is not pulled out of the alternating-current charging interface socket, the signal end of the alternating-current charging interface CC of the alternating-current charging interface socket keeps an effective resistance state RCC, and the wake-up signal WKP output by the wake-up input module 200 keeps a high level;
under this condition, if the second power module 600 has DC5V output, the sampling signal VTCC is high; if the second power module 600 does not have DC5V output, then the sampled signal VTCC is 0V.
Fourthly, when the charging gun is pulled out from the ac charging interface socket, the ac charging interface CC signal terminal of the ac charging interface socket is changed from the effective resistance state RCC to the high resistance state, the wake-up signal WKP output by the wake-up input module 200 is changed from the high level to the low level,
so that the second power module 600 has no DC5V output, the resistor R32 pulls the sampling signal VTCC low to 0V.
In the utility model discloses in, specifically realize, it is to explain that BMS main control chip 500 can use brand, series and the model of present general application, like TC265 of MC9S12 series, the TC2 series of the english flying of NXP, BMS main control chip 500' S model is not in the utility model discloses in the protection scope.
According to the technical scheme, based on the utility model discloses a BMS main control chip can be awaken up to the CC signal that charges in interchange to after BMS main control chip awakens up, the resistance value that can real-time supervision CC port judges charging cable capacity.
To sum up, compare with prior art, the utility model provides a pair of exchange CC signal detection circuitry that charges with awaken function, its design science can detect whether the interface connects completely, can awaken up BMS again and do not influence BMS dormancy. Meanwhile, the detection function of the interface connection state and the awakening function of the BMS are realized, and the method has great production practice significance.
For the technical scheme of the utility model, the hardware circuit design is scientific, the electronic components are of universal application models, the model selection is easy, and the components are low in price;
in addition because the utility model discloses a hardware circuit consumption is lower, so can adopt the surface mounted type miniwatt electronic components, therefore circuit board occupation space is little, has greatly reduced material cost. Therefore, the technical scheme of the utility model has very strong practical value and market spreading value.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. An AC charging CC signal detection circuit with a wake-up function is characterized by comprising a first power module (100), a wake-up input module (200), a wake-up output module (300), a sampling module (400), a BMS main control chip (500) and a second power module (600);
the input end of the first power supply module (100) is connected with a normal power 12V;
the output end of the first power supply module (100) is connected with the first input end of the awakening output module (300) and is used for providing a constant voltage of 5V for the awakening output module (300);
a wake-up input module (200), the first input end of which is connected with a normal power 12V;
a wakeup input module (200), a second input end of which is connected with a CC signal end of the existing AC charging interface socket and is used for receiving a charging connection confirmation CC signal from the CC signal end;
the output end WKP of the awakening input module (200) is connected with the second input end of the awakening output module (300) and is used for outputting an awakening signal WKP in a corresponding level state to the awakening output module (300) according to the state of the CC signal end of the AC charging interface socket;
a wake-up output module (300), a first input end of which is connected with an output end of the first power supply module (100), and is used for receiving the constant power 5V output by the first power supply module (100);
a wake-up output module (300), a second input end of which is connected to the output end WKP of the wake-up input module (200), and is configured to receive a wake-up signal WKP sent by the wake-up input module (200);
the third input end of the awakening output module (300) is connected with the output end OFF of the BMS main control chip (500) and is used for receiving the dormancy control signal OFF sent by the BMS main control chip (500), and correspondingly outputting an enable signal EN to the second power supply module (600) at the output end EN according to the state of the signal to control the on-OFF of the second power supply module (600);
the output end EN of the awakening output module (300) is connected with the input end of the second power module (600) and is used for correspondingly outputting an enable signal EN with a corresponding level state to the second power module (600) according to the level state of the awakening signal WKP sent by the awakening input module (200) and controlling whether the second power module (600) outputs DC5V to the BMS main control chip (500), namely controlling the on-off of the second power module (600);
a sampling module (400) having a first input connected to the output of the second power module (600) for receiving DC 5V;
the second input end of the sampling module (400) is connected with the CC signal end of the AC charging interface socket and is used for receiving a charging connection confirmation CC signal output by the CC signal end of the AC charging interface socket;
the output end VTCC of the sampling module (400) is connected with the second input end of the BMS main control chip (500) and is used for outputting a sampling signal VTCC of the CC signal;
the BMS main control chip (500) is connected with the output end of the second power supply module (600) at the first input end and is used for receiving the DC5V output by the second power supply module (600);
a second power module (600) for determining whether to output DC5V to the BMS main control chip (500) according to the control of the wake-up output module (300) and waking up the BMS main control chip (500) when outputting DC 5V;
the second input end of the BMS main control chip (500) is connected with the output end VTCC of the sampling module (400) and is used for receiving the sampling signal VTCC output by the output end VTCC of the sampling module (400);
the BMS main control chip (500) is used for judging the connection state of the CC signal end of the alternating current charging interface socket according to the voltage value of the high potential of the sampling signal VTCC;
and the output end OFF of the BMS main control chip (500) is connected with the third input end of the awakening output module (300) and is used for outputting the dormancy control signal OFF to the awakening output module (300).
2. The ac charging CC signal detection circuit with wake-up function of claim 1, wherein the wake-up input module (200) comprises: resistors R1-R7, diodes D1-D2 and switching tubes Q1-Q2, wherein:
a 1 st pin of the resistor R1 is used as a second input end of the awakening input module (200) and is connected with a normal power 12V;
the 1 st pin of the resistor R1 is also connected with the 1 st pin of the resistor R4;
a 2 nd pin of the resistor R1 is connected with the anode of the diode D1;
the cathode of the diode D1 is used as a second input end of the awakening input module (200) and is connected with an alternating current charging interface CC signal end of the alternating current charging interface socket;
the AC charging interface CC signal end of the AC charging interface socket is also respectively connected with the cathode of the diode D2, the 1 st pin of the resistor R3 and the grid G of the switch tube Q1;
the anode of the diode D2 is connected with the 1 st pin of the resistor R2;
the 2 nd pin of the resistor R2 is connected with the V1 end;
the V1 end is respectively connected with the 2 nd pin of the resistor R5, the 1 st pin of the resistor R6 and the base B of the switch tube Q2;
the 1 st pin of the resistor R5 is respectively connected with the 2 nd pin of the resistor R4 and the emitter E of the switching tube Q2;
the 2 nd pin of the resistor R6 is respectively connected with the 2 nd pin of the resistor R3 and the source S of the switching tube Q1;
the drain D of the switching tube Q1 is connected with the ground end GND;
the collector C of the switch tube Q2 is connected with the 1 st pin of the resistor R7;
the 2 nd pin of the resistor R7 is connected with the ground terminal GND;
and the collector C of the switching tube Q2 is used as the output end WKP of the awakening input module (200).
3. The ac charging CC signal detection circuit with wake-up function according to claim 1, wherein the wake-up output module (300) comprises: resistors R8-R21, diodes D3-D4, capacitors C1-C3, switch tubes Q3-Q5 and a T trigger U1, wherein:
a 1 st pin of the resistor R21 is used as a first input end of the awakening output module (300), is connected with an output end of the first power supply module (100), and is used for receiving a constant voltage of 5V;
the 2 nd pin of the resistor R21 is connected with the emitter E of the switching tube Q5;
the collector C of the switch tube Q5 is connected with the 1 st pin of the resistor R15;
a base electrode B of the switching tube Q5 is connected with a collector electrode C of the switching tube Q4;
a base B of the switching tube Q4, which is respectively connected with the 1 st pin of the resistor R19 and the 2 nd pin of the resistor R20;
an emitter E of the switching tube Q4 is respectively connected with a No. 2 pin of the resistor R19 and a ground end GND;
a 1 st pin of the resistor R20 is used as a second input end of the awakening output module (300) and is connected with an output end WKP of the awakening input module (200);
the 1 st pin of the resistor R20 is also connected with the 1 st pin of the resistor R8;
a 2 nd pin of the resistor R15 is connected with a power supply input terminal VCC of the T trigger U1;
the input end T of the T trigger U1 is connected with the TIN end;
the TIN end is respectively connected with the 2 nd pin of the resistor R8, the 1 st pin of the capacitor C1, the 2 nd pin of the resistor R9 and the 2 nd pin of the resistor R12;
a clock signal input end CP of the T-flip-flop U1 is respectively connected with the cathode of the diode D3, the cathode of the diode D4 and the 1 st pin of the resistor R11;
the output end Q of the T trigger U1 is connected with the 1 st pin of the resistor R16;
a 2 nd pin of the resistor R16 is used as an output end of the awakening output module (300) and is connected with an enable end EN;
the enable end EN is connected with the input end of the second power supply module (600);
the enable terminal EN is also connected with a 1 st pin of the resistor R17;
the 2 nd pin of the resistor R17 is connected with the ground terminal GND;
the anode of the diode D3 is connected with the 1 st pin of the resistor R18;
the 2 nd pin of the resistor R18 is connected with the output end OFF of the BMS main control chip (500);
the 2 nd pin of the capacitor C1 is connected with a ground terminal GND;
the 2 nd pin of the resistor R11 is connected with the ground terminal GND;
the anode of the diode D4 is connected with the V2 end;
a V2 terminal connected with the collector C of the switch tube Q3 and the 1 st pin of the resistor R10 respectively;
the 2 nd pin of the resistor R10 is respectively connected with the 1 st pin of the capacitor C2 and the 1 st pin of the resistor R9;
the 2 nd pin of the capacitor C2 is connected with a ground terminal GND;
a 2 nd pin of the resistor R9 is connected with a TIN end;
a base B of the switching tube Q3, which is respectively connected with the 1 st pin of the resistor R13 and the 1 st pin of the resistor R14;
an emitter E of the switching tube Q3 is connected with a ground end GND;
the 2 nd pin of the resistor R14 is connected with the ground terminal GND;
the 2 nd pin of the resistor R13 is respectively connected with the 1 st pin of the capacitor C3 and the 1 st pin of the resistor R12;
a 2 nd pin of the resistor R12 is connected with a TIN end;
pin 2 of capacitor C3 is connected to ground.
4. An AC charging CC signal detection circuit with wake-up function as claimed in claim 3 wherein the T flip-flop U1 is a positive edge triggered flip-flop.
5. An AC charging CC signal detection circuit with wake-up functionality according to any of the claims 1 to 4 characterized in that the sampling module (400) comprises: resistors R30-R33 and a diode D20, wherein:
a 2 nd pin of the resistor R30, which is used as a first input terminal of the sampling module (400), is connected with the output terminal of the second power supply module (600), and is used for receiving DC 5V;
the 1 st pin of the resistor R30 is connected with the V3 end;
a V3 terminal connected to the 1 st pin of the resistor R31 and the 2 nd pin of the resistor R33, respectively;
a 2 nd pin of the resistor R31, which is used as an output terminal VTCC of the sampling module (400);
the 2 nd pin of the resistor R31 is connected with the 1 st pin of the resistor R32;
the 2 nd pin of the resistor R32 is connected with the ground terminal GND;
the 1 st pin of the resistor R33 is connected with the anode of the diode D20;
and the cathode of the diode D20 is used as a second input end of the sampling module (400) and is connected with an AC charging interface CC signal end of the AC charging interface socket.
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| CN202120140867.2U CN214822707U (en) | 2021-01-19 | 2021-01-19 | AC charging CC signal detection circuit with awakening function |
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| CN202120140867.2U CN214822707U (en) | 2021-01-19 | 2021-01-19 | AC charging CC signal detection circuit with awakening function |
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Effective date of registration: 20220126 Address after: 266500 Minshan Road, Huangdao District, Qingdao, Shandong Patentee after: LISHEN (QINGDAO) NEW ENERGY CO.,LTD. Address before: 300384 Tianjin Binhai New Area Binhai high tech Industrial Development Zone Huayuan science and Technology Park (outer ring) 38 Haitai South Road Patentee before: LISHEN POWER BATTERY SYSTEMS Co.,Ltd. |